I keep it until I absolutely must use it. Getting a few off a point can be done without it with the right team and tactics. But you're right, it is extremely situational
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Keyword "right team" which means playing with friends. More then half of the gaming community games alone. So your going to rely on a bunch of random teammates with zero communication(due to Bungie not putting a communication system) to help clear a zone. Good luck with that. Have I had games with randoms that knew what they're doing, you bet, they were the best games I've had but those games were a few and far between.